Make prebuilt_sdk support module-lib and system-server

This makes prebuilt_sdk look for and create modules in the module-lib
and system-server subdirs too, e.g.:
    framework-wifi.api.module-lib.latest

Bug: 149293194
Test: follow-up change
Change-Id: Idbded6b633315034e669e9c5dd2bd30725d5c76b